William t



(No Model.)

W. T. BARRATT. GAM POR KITTING MACHINES.

No. 801,408. Patented Mar. 29,1898.

ill-l I hm l l l NITED STATES ATENT Fries.

VILLIAM T. BARRATT, OF BENNINGTON, VERMONT, ASSIGNOR TO CHARLES COOPER, OF SAME PLACE.

CA'IVI FOR KNlTTlNG-MACHINES.

SPECIFICATION forming part of Letters Patent No. 601,408, dated March 29, 1898. Application iiled March 11,1897. Serial No. 626,996. (No model.)

To all whom it may concern:

Be it known that 1, WILLIAM T. BARRATT, a citizen of the United States,residing at Bennington, in the county of Bennington and State of Vermont, have invented certain new and useful Improvements in Cams for Knitting-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form part of this specification.

My invention has reference to improvements upon the draw-up cam patented to me December 8, 1896, No. 572,690.

My patented cam is made in two parts adjustable with respect to each other; but the parts are hinged together` bya knee-joint and so constructed with reference to each other that when the part provided with the point of the cam is adj usted it is necessary to also adjust the casting-off part, which is not always desired. tion of my patented cam is such at the casting-off point that ten or twelve stitches are drawn tight at once. This is objectionable in that if the yarn is tender or uneven when 4the strain comes on tight stitches it is liable to break and thereby result in imperfect work.

The objects of my invention therefore are, first, to provide a cam of the kind stat-ed in which the adjustments at either the end where the needles press or the end where the needles are cast off are entirely independent of each other, thereby economizing time in adjusting the cams properly to do the work, and, second, to provide a cam with means for ca'sting o the stitches and drawing them tight, one at a time, so that when the loops are not all of the same length it will draw from the loose to the tight ones and even them up and thereby improve the character of the work and enable the more tender yarn to be more safely used than heretofore and to provide adjustable means on the cam for casting olf; and my invention consists in the peculiarities of construction hereinafter described, and

I more particularly set forth in the claims.

Furthermore, the construcchine with my improvements applied thereto. Fig. 2 is a rear perspective view of the cam land its supporting-bracket detached from the machine andjof the casting-off means upon the cam. Fig. 3 is a rear elevation of the supporting-bracket alone. Fig. 4 is a front elevation of the cam with the casting-off .means removed, and Eig. 5 is a perspective detail view of the casting-off and needle-re- 6o turning devices.

Like reference-numerals refer to corresponding parts in each igure of the drawings.

1 designates the upper and lower needlecylinders, 2 the cylinder-supporting rings, 65 and 3 the spring-bands encircling the needlecylinders and holding the needles in position, which parts may be of the ordinary construction.

5 designates the draw-up cam, and 6 the 7o supporting-bracket therefor, said bracket having a horizontal arm 7, provided with two elongated openings 8, through which screwbolts 9 pass into the upper cylinder-ring 2 and serve to secure said bracket adjustably thereto. The inner surface of the vertical arm 10 of the bracket is formed with two grooves 11, which are located adjacent to the center thereof, Vand between each of said grooves and the nearer vertical edge 'of said 8o arm is an elongated opening 12.

The cam 5 is made in two parts 13 and 14., which are divided from each other on astraight line. Each cam section is provided with guide-pins 15, projecting into the adjacent groove 11, and extending horizontally through the openings 12 from the cam-sections are screw-bolts 16 and 17 for securing the camsections independently in adj usted positions, while screw-bolts 18 and 19 for adjusting the 9o respective cam-sections extend through the lower horizontal edge of the bracket-arm 10 and into said openings 12 and engage said screw-bolts 16 and 17, respectively. It will be observed that the construction described permits either part of the cam to be adjusted independently of the other and to be separately held in the adj usted positions. This ndependent adjustment of the respective ends of the cam is important, as it is not always nec- Ico essary or desirable to adjust both ends at the same time. The cam-surface of the part 13 is formed with the successive elevations 20,

v21, and 22 and with a depression 23 at the junction of said elevations 21 and 22. The upper longitudinal edge r24 of the part 14 where said part abuts thevertical edge of part 13 is beveled, as shown at 25, and rearward thereof said upper edge is formed with an opening 26, communicating with a groove 27, formed in the outer face of said part 14. This groove receives the stem 28 of a castingoff piece, while the laterally-enlarged head 29 of said casting-off piece sets into said opening 26 and projects above the plane of said edge 24 and is curved, as shown. Said stem 28 is provided with a pin 30, which projects into an opening 31, formed in the inner wall of said groove, said opening being of greater size than the diameter of said pin. The casting-off piece is held adjustably on the cam by means of a screw-bolt 32, as shown in Fig. 1, the head of which engages said stem 28, while the bolt is secured in opening 33 in said part 14.

34 designates a plate formed with an elongated opening 35 and adjustably held on the cam part 14 by a screw bolt 36, passing through said opening into the opening 37 in said part of the cam, as shown in Fig. 1. The upper end vof this plate is bent at right angles to form the part 38, which extends over the edge 24 of cam-section 14 and at a slight distance therefrom, and from said part 38 eX- tends in an upwardly-inclined direction the arm 39, which projects over the head 29 of the casting-off piece. It will be observed that the means for securing the plate 34 to the cam permits said plate, and in consequence the arm 39, carried by it, to be adjusted upon the cam and held rigidly in adjusted position.

In the operation of the device the needles 40 (shown in Fig. 1) are drawn up the inclined surfaces of the part 13 of the cam to the arm 39 and underneath the part 38 and upon the edge 24 to the cam 41 and are forced down by the latter, as is common in this style of knitting-machines. Thus it will be seen that each needle is raised at the casting-off end of the cam to above the plane of the edge formed with two grooves located adjacent to each other and with an elongated opening between each of said grooves and the nearer vertical edge of the arm of a draw-up cam divided upon a straight line into two independently-adjustable parts, guide-pins projecting from said parts into the grooves, and two fastening-bolts projecting into said elongated openings for holding said parts independently in adjusted position, substantially as and for the purpose set forth.

2. In a knitting-machine, the combination with the cam having an opening in its edge and a groove in its face, of a casting-off piece adj ustably secured to said cam, and having a stem received by said groove and a laterallyenlarged curved head' received by said opening, substantially as and for the purpose set forth.

3. In a knitting-machine, the combination with the cam, and the casting-olf piece adjustably secured thereto and operating to draw the stitches tight one at a time, of a plate adjustably secured to said cam and having a bent upper end extending over the edge thereof at a slight distance therefrom, and an inclined armextending from said bent part of the plate 'above the casting-off piece, substantially as and for the purpose set forth.

4. The herein-described draw-up cam comprising two independently-adjustable parts, a casting-0E piece adj ustably secured upon one of said parts and operating to draw the stitches tight one at--a time, and a needle-returning plate adjustably secured to said part of the cam and extending over the end thereof rearward of the. casting-off piece and having an arm projecting over said casting-off piece, substantially as and for the purpose set fort In testimony whereof -I affix my signature in presence of two witnesses.

WILLIAM T. BARRAT'I.

Witnesses:

CHARLES S. KEHOE, FRANK HERVEY.

IOO 

